"TRIODE VS ULTRALINEAR : Triode is considered the ‘BEST’ way to listen to tubes. Although the output decreases, the bandwidth increases, the distortion decreases, and damping factor increases.
ULTRALINEAR MODE is a superb compromise. The output power is more than TRIODE, yet you have most of the benefits of TRIODE. You have Better LINEARITY, Greater DAMPING FACTOR, and Lower DISTORTION, but virtually the same Power Output as PENTODE."